It would be really nice if you would have expamples
use the /g option at the end of the reg. expr. A lot of
people I know avoid using the $_ character and instead
like to use a variable assignment with the =~ explicitly.
Thanks
P.S. Good site otherwise, but your Reg Exp. section could
use more expamples.

#!/usr/bin/perl -w
#
# Here is a CGI example of using a regexp to parse a query string,
# when you're not sure exactly what will be in the query string
# Put it in you web space, and call it with
# http://host/script?param_1=this&param_2=that&the_other=doesntmatchth+emask
# or call it with ?error=HelloWebMaster if you want to fill the error +log with garbage
#
use CGI qw( :standard :HTML );
# set slay typos
use strict;
# read in the CGI params
my $object = new CGI();
# print our HTML header
print header(),h1( "params: " );
my $key;
# set our variable mask. This part gets thrown out.
# At makeyourbanner.com, I use more than one pattern,
# so that I can determine the number of text areas and style settings +dynamically.
# in CGI programming, this is very handy if you are designing a backen+d,
# and don't have advanced knowledge of how the front end will call it.
my $mask = "param_";
foreach $key ( $object->param() ) {
if ( $key =~ /^($mask)(.+)/ ) {
#found a parameter, print it out
print "<P>param $2=", $object->param( $key ), "</P>";
} elsif ( $key =~ /error/i ) {
#found error flag, print error to the appache logs (you ARE us+ing apache, right?!)
print STDERR "error: found $key=", $object->param( $ke+y ), " in $0\n";
}
}